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ML6420CS-5

Triple/Dual Phase-Equalized, Low-Pass Video Filter

Micro Linear Corporation 

ML6420

USING VIDEO FILTERS (CONTINUIED)

The output waveform is not symmetric. All ringing occurs

after the main pulse. Result is visual smearing and fine

ghosting to the right of every edge in the picture. See old

Figure 19a.

Phase Corrected Analog Filter

Output waveform is substantially symmetric. Ringing is

greatly reduced. Result is increase in apparent resolution.

No smearing or ghosting.

Analog Filtering in the Time Domain

Output waveform is symmetric. Ringing is about the same

as ML6420 alone. Difference between purely analog and

analog/digital approach is subtle and will only have a

material effect on multi-pass video processing.

TYPICAL ANALOG FILTER

Figure 19a.

ML6420

5.5MHz TYP

Figure 19b.

DIGITAL FILTER

HALF-BAND

Figure 19c.

10

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